bunker

1. N-COUNT A bunker is a place, usually underground, that has been built with strong walls to protect it against heavy gunfire and bombing. 地堡

...an extensive network of fortified underground bunkers. …一個大範圍的地下防禦工事網絡。

2. N-COUNT A bunker is a container for coal or other fuel. 燃料艙

3. N-COUNT On a golf course, a bunker is a large area filled with sand that is deliberately put there as an obstacle that golfers must try to avoid. (高爾夫球場的) 沙坑

He put his second shot in a bunker to the left of the green. 他把第二杆球打進了草地左邊的沙坑。